Mounting for a combing cylinder

ABSTRACT

In porcupine card clothing for textile machines, in particular combing machines, comprising a plurality of combing segments disposed one after the other in the direction of rotation of the porcupine, each combing segment being formed by successive serrated punched cut-outs with a root and with teeth that face away from the root, with the configuration of the teeth of the card clothing changing in the direction of rotation, it is provided that the card clothing ( 1 ), in its entirety, is embodied such that the parameters which include the distance (T) between the teeth ( 13 ) and/or the angle of engagement (E) and/or the free passage (D) between the teeth ( 13 ) and/or the height (H) of the teeth ( 13 ) change at varying angular positions seen in the circumferential direction of the card clothing ( 1 ).

[0001] Porcupine card clothing for textile machines, in particularcombing machines, comprising a plurality of combing segments disposedone after the other in the direction of rotation of the porcupine, eachcombing segment being formed by successive serrated punched cut-outswith a root and with teeth that face away from the root, with theconfiguration of the teeth of the card clothing changing in thedirection of rotation.

[0002] Card clothing of the generic type is known from EP 0 179 158which provides for a configuration of the tips within a single serratedpunched cutout such that the height of the tips, the angle of engagementand the distance of the tips from each other increase in the directionof rotation. The corresponding progressive change ensures gentlepenetration into, as well as relaxation and lifting of, the sliver.

[0003] DE 299 13 366 describes card clothing in which the segment thatfirst penetrates the sliver in the direction of rotation has a combingeffect inferior to that of the subsequent segments that pass through thesliver, with the subsequent segments, in the circumferential direction,having a greater length than the leading segment. However, thisdimensioning in the circumferential direction and a progressive heightor density of serration are not sufficient for optimal combing results.

[0004] It is an object of the invention to improve the prior art cardclothing and optimize the combing result.

[0005] According to the invention, this object is attained in that thecard clothing, in its entirety, is embodied such that the parameterswhich include the distance between the teeth and/or the angle ofengagement of the respective tooth flank and/or the free passage betweenthe teeth and/or the height of the teeth change at varying angularpositions in the circumferential direction of the card clothing.

[0006] The design, according to the invention, of the card clothingenables short fibers to be gently removed by combing. Moreover, thegeneral combing result has been found to be clearly improved as againstcomparable card clothing. The comparatively finely differentiatedstructure of the configuration according to the invention has provedsurprisingly efficient.

[0007] Details of the invention will become apparent from the ensuingdescription of a preferred embodiment, taken in conjunction with thedrawing, in which:

[0008]FIG. 1 comprises diagrammatic illustrations of card clothing forexplanation of the parameters involved according to the invention;

[0009]FIG. 2 is a view of a first embodiment of the card clothingaccording to the invention; and

[0010]FIG. 3 is a sectional view on the line A-A of FIG. 1.

[0011] In the exemplary embodiment, the card clothing 1, as seen in thedrawing, for a cylindrical comb (not shown) includes four detents 2, 3,4, 5 which are disposed one after the other in the direction of rotation(arrow P), each comprising successive serrated punched cut-outs 6, 7, 8,9. Lining up and retaining the serrated punched cut-outs 6, 7, 8, 9 isimplemented in a manner known per se by dove-tail grooves 10 and drilledholes 11 disposed by the side thereof.

[0012] Each serrated punched cut-out 6, 7, 8, 9 comprises a root 12where the recesses 10, 11 are formed and a plurality of teeth 13 thatface away from the root 12 outwards approximately in the radialdirection.

[0013] These teeth 13 slope in the direction of rotation (arrow P),having a leading flank 14 that first penetrates into the sliver, and arear flank 15.

[0014] The configuration of these teeth 13 as compared to the precedingand succeeding teeth and to the teeth 13 beside them seen in thedirection of the axis of rotation can be described by various parameterswhich will be explained in conjunction with FIG. 1:

[0015] A first parameter is the angle of engagement E of the leadingtooth flank 14 i.e., the angle made by this leading flank 14 and theradial direction R. This parameter E is illustrated in FIG. 1a.

[0016] As seen in FIG. 1b, another parameter is the free passage Dbetween two teeth 13 or serrated punched cut-outs 6, 7, 8, 9 which lieside by side within one and the same detent 2, 3, 4, 5.

[0017] The distance T between two neighboring teeth in the direction ofcombing (arrow P) is another parameter seen in FIG. 1c.

[0018] Finally, FIG. 1d illustrates the height H of the teeth as aparameter. The height H is measured between the fictitious upper edge 16of the root 12 and the external envelope curve 17 of the tips 18 of theserration.

[0019]FIG. 2 shows a first embodiment of the card clothing 1 accordingto the invention wherein one of the serration parameters, namely theangle of engagement E, the free passage D, the distance T and the heightH, changes at varying angular positions with each of the radiuses R1 toR16 that are plotted successively in the direction of combing (arrow P)so that, seen in the direction of combing, the height H increases, thefree passage D increases, the distance T increases and the angle ofengagement E decreases.

1. Porcupine card clothing for textile machines, in particular combingmachines, comprising a plurality of combing segments disposed one afterthe other in the direction of rotation of the porcupine, each combingsegment being formed by successive serrated punched cut-outs with a rootand with teeth that face away from the root, with the configuration ofthe teeth of the card clothing changing in the direction of rotation,characterized in that the card clothing (1), in its entirety, isembodied such that at least two of the parameters which include thedistance (T) between the teeth (13) and/or the angle of engagement (E)and/or the free passage (D) between the teeth (13) and/or the height (H)of the teeth (13) change at varying angular positions in thecircumferential direction of the card clothing (1).
 2. Card clothingaccording to claim 1, characterized in that, seen in the direction ofcombing (arrow P), the height (H) of the teeth (13) increases, the freepassage (D) decreases, the distance (T) between the teeth (13) increasesand the angle of engagement (E) decreases.
 3. Card clothing, inparticular for cotton combing machines, according to claim 1,characterized in that in front, seen in the direction of combing, theangle of engagement (E) is ≦27°, in particular 21 to 25°, preferablyapproximately 23°.
 4. Card clothing, in particular for cotton combingmachines, according to claim 1, characterized in that at the back, seenin the direction of combing, the angle of engagement (E) is ≧48°. 5.Card clothing, in particular for wool combing machines, according toclaim 1, characterized in that for wool combs, the angle of engagement(4) seen in the direction of combing is >34°, in particular 21 to 31°,preferably 30°.
 6. Card clothing, in particular for wool combingmachines, according to claim 1, characterized in that at the back, seenin the direction of combing, the angle of engagement (E) is <46°.